One problem is that Bijur pumps are usually neglected and the oil tends to gum up after a while, the sump should be removed and the pump and filter cleaned, also you will probabally find that at each termination point there is a metering device, it look just like a straight brass fitting but it has a number on it which indicate the size of the orifice. These can become blocked over the years and the best way is to replace them all. If one has been blocked for any length of time the line will probabally be gummed up and need flushing.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.